Node.js基础教程

Arce

Node.js 的推出，不仅从工程化的角度自动化掉更多琐碎费时的工作，更打破了前端后端的语言边界，让 JavaScript 流畅的运行在服务器端，本系列课程旨在引导前端开发工程师，以及 Node.js 初学者走进这个活泼而有富有生命力的新世界。

什么是node.js
是编写高性能服务器的JavaScript工具包
单线程，异步，事件驱动
特点，快，耗内存多
node.js性能高，开发效率高，应用范围广

node.js的安装：
下载地址：http://node.js.cn

测试下安装环境：
dos下命令行：npm
查看npm的版本：npm -v
查看node.js版本命令行：node -v

node.js是一个基于Chrome v8引擎的JavaScript运行环境，Node.js使用了一个事件驱动，非阻塞式i/o的模型，使其轻量又高效。
node.js的包管理器npm，是全球最大的开源系统。

var  http  =  require('http');  
http.createServer(function  (request,  response)  {  
  response.writeHead(200,  {'Content-Type':  'text/html;  charset=utf-8'});  
  if(request.url!=="/favicon.ico"){  //清除第2此访问  
    console.log('访问');  
    response.write('hello,world');  
    response.end('hell,世界');//不写则没有http协议尾,但写了会产生两次访问  
  }  
}).listen(8000);  
console.log('Server  running  at  http://127.0.0.1:8000/');

var  http  =  require('http');  
var  otherfun  =  require('./models/otherfuns.js');    
http.createServer(function  (request,  response)  {    
    response.writeHead(200,  {'Content-Type':  'text/html;  charset=utf-8'});    
  if(request.url!=="/favicon.ico"){  //清除第2此访问  
    otherfun.controller(request,response);  
    otherfun.call(response);  
    response.end('');  
  }  
}).listen(8000);    
console.log('Server  running  at  http://127.0.0.1:8000/');  
//---普通函数    
function  fun1(res){    
  res.write("你好,我是fun1");    
}

function  controller(req,res){    
  //res.write("发送");    
  call('hello',req,res);    
  res.end("");    
}    
function  call(res){    
  console.log('call');    
}    
module.exports  =  controller;  //只支持一个函数    
    
/*    
//支持多个函数    
module.exports={    
  getVisit:function(){    
  return  visitnum++;    
  },    
  add:function(a,b){    
  return  a+b;    
  }    
}    
*/

var  http = require('http');  
var  otherfun  =  require("./models/otherfuns.js");
http.createServer(function (request, response) {    
    response.writeHead(200,   {'Content-Type': 'text/html;    charset=utf-8'});    
    if(request.url!=="/favicon.ico"){    //清除第2此访问
      //fun1(response);
      //-------用字符串调用对应的函数---
      funname  =  'fun3';
      otherfun[funname](response);
      //otherfun['fun3'](response);
      response.end('');  
  }
}).listen(8000);    
console.log('Server  running   at   http://127.0.0.1:8000/');

module.exports = {
 fun2:function(res) {
  console.log("我是fun2");
 },
 fun3:function(res){
  console.log("我是fun3");
  res.write("你好");
 }
}

var http = require('http');
var otherfun = require("./models/otherfuns.js");
http.createServer(function (request, response) {
 response.writeHead(200, {'Content-Type': 'text/html'}
 if(request.url !== "/favicon.icon") {
  otherfun(response);
  response.end('');
  }
  }).listen(8000);
  console.log('server running at http://127.0.0.1:8000/');
  
  function fun1(res){
   console.log("fun1");
   res.write("hello");
  }

var http = require('http');
var otherfun = require('./models/otherfuns.js");
http.createServer(function (request, response) {
 response.writeHead(200,{'Content-Type': 'text/html'});
 if(request.url !== "/favicon.ico"){
  //fun1(response);
  otherfun(response);
  response.end('');
  }
 }
}).listen(8000);


function fun1(ress){
 console.log("fun1");
 res.write("hello");
 }

function fun2(res){
 console.log("我是fun2");
 res.write("你好");
}
module.exports = fun2; // 只支持一个函数

module.exports = {
// 支持多个函数
 fun2: function(res){
  console.log("我是fun2");
  res.write("你好");
 },
 fun3: function(res){
  console.log("我是fun3");
  res.write("你好");
 }
}

if(request.url!=="/favicon.ico"){//清除第2次访问
 otherfun.fun2(response);
 otherfun.fun3(response);
 response.end('');
 }
}).listen(8000);

otherfun['fun2'](response);
otherfun['fun3'](response);
response.end('');

node.js调用模块

function User(){
 this.id;
 this.name;
 this.age;
 this.enter=function(){
  console.log("进入图书馆");
 }
}

模块的调用

var http = require('http');
// var User=require('./models/User');
var Teacher = require("./models/Teacher');
http.createServer(function (request,response) {
response.writeHead(200,{'Content-Type': 'text/html; charset=utf-8'});
if(request.url!=="/favicon.ico"){//清除第2此访问
 teacher = new Teacher(1,'小红',30);
 teacher.teacher(response);
 response.end("");
  }
 }).listen(8000);

function User(id,name,age) {
this.id=id;
this.name=name;
this.enter=function(){
console.log("haha");
}
}
module.exports = User;


// models/Teacher.js
var User = require('./User');
function Teacher(id,name,age) {
User.apply(this,[id,name,age]);
this.teach=function(res){
res.write(this.name+"dashu");
}
}
module.exports = Teacher;

var User = require('./User');
function Teacher(id, name, age) {
 User.apply(this,[id,name,age]);
 this.teach=function(res){
  res.write(this.name+"讲课");
 }
 }
 module.exports = Teacher;

var http = require('http');
// var User = require("./models/User");
var Teacher = require("./models/Teacher");
http.createServer(function (request, response) {
 response.writeHead(200,{'Content-Type':'text/html; charset=utf-8'});
 if(request.url!=="/favicon.ico"){
  teacher = new Teacher(1,'dashu', 20);
  teacher.enter();
  teacher.teach(response);
  response.end('');
  }
 }).listen(8000);

node.js路由：

var http = require('http');
var url = require('url');
var router = require('/router');
http.createServer(function(request,response){
respnse.writeHead(200, {'Content-Type': 'text/html'; charset=utf-8"});
if(request.url!=="/favicon.ico"){
 var pathname=url.parse(request.url).pathname;
 // console.log(pathname);
 pathname = pathname.replace(/\//, ");// 替换掉前面的
 // console.log(pathname);
 router[pathname](request,response);
 response.end(");
  }
 }).listen(8000);
 
 module.exports={
  login: function(req,res){
   res.write("我是login");
  }
  zhuce: function(req,res){
   res.write("我是注册");
  }
 }

读取文件：

var http = require('http');
var optfile=require('./models/optfile');
http.createServer(function (request, response) {
 response.writeHead(200, {'Content-Type': 'text/html; charset=utf-8'});
 if(request.url!=="/favicon.ico"){
 console.log('访问');
 response.write("hello");
 optfile.readfile();
 response.end('hello");
 }
}).listen(8000);


var fs = require('fs');
module.exports = {
readfile:funciton(path){
 fs.readFile(path, function(err,data){
  if(err){
   console.log(err);
   }else{
   console.log(data.toString());
   }
   });
   console.log("dashu");
  },
  readfileSync:function(path){
  var data=fs.readFileSync(path,'utf-8');
  console.log("同步方法");
  return data;
  }
 }